Just don't lay him on his back. Might have to baby wear until he gets comfortable. How does he sleep?

I let my son do tummy time on me when he would cry. I use to lay flat on my back on the floor and put him on me and he would start to lift his head up. I always used a tummy time pillow, helped him not feel so flat on the ground which worked better. You can get one at Walmart where the night lights and stuff are for babies.

I started putting a rolled up towel under my daughters arms which kept her propped up until her neck got stronger. She seemed to. It cry as much.